A new video interview on PC Games.de talks with Valve honcho Gabe Newell about DOTA 2 and Counter-Strike Global Offensive during Gamescom. At around the 15:00 mark they ask if Counter-Strike Global Offensive will support cross-platform gaming like Portal 2 does between PC and PS3, and he explains that this is their goal:

That's certainly our goal. We never want to create these 'islands of players.' You have to be sensitive to control differences, and make sure you're accommodating that, but, you know, our view is players should be able to play as part of a community on whatever device they can. You know, sometimes there are contractual, or other issues that make that hard, where somebody, a platform holder doesn't want you to do that for whatever reason, but that's always out preference. is to let customers play and be part of the larger community.

I've never seen the argument. I wouldn't pay attention to anyone making it. I know plenty of people that prefer controllers, me being one of them (well, I prefer couches, which mandate controllers), but I'd never once claim a controller can compare to a m+k.

Well, yeah, of course you'd never argue that. You play PC games and have been playing shooters since the 90's. However, there's a large portion of the console demographic that started playing shooters with Halo or CoD and these are the people who think gamepads are just as quick and precise as M/KB.